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Document and Entity Information
Aug. 01, 2023
Document And Entity Information [Line Items]  
Entity Registrant Name FISERV INC
Amendment Flag true
Entity Central Index Key 0000798354
Document Type 8-K/A
Document Period End Date Aug. 01, 2023
Entity Incorporation State Country Code WI
Entity File Number 1-38962
Entity Tax Identification Number 39-1506125
Entity Address, Address Line One 255 Fiserv Drive
Entity Address, City or Town Brookfield
Entity Address, State or Province WI
Entity Address, Postal Zip Code 53045
City Area Code (262)
Local Phone Number 879-5000
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Amendment Description Fiserv, Inc. (the “Company”) filed a Current Report on Form 8-K on August 1, 2023 (the “Original Form 8-K”) reporting, under Item 5.02, the appointment of Charlotte Yarkoni to its board of directors. Because Ms. Yarkoni was not appointed to serve on any committee of the board of directors at the time the Original Form 8-K was filed, disclosure of the committees of the board of directors on which she would serve was not included in accordance with Instruction 2 to Item 5.02. The Company hereby amends Item 5.02 of the Original Form 8-K to include information on the committee assignments. Other than providing the additional information, no other disclosure in the Original Form 8-K is amended by this Form 8-K/A. On February 21, 2024, the board of directors of the Company appointed Ms. Yarkoni to the Audit and Risk committees of the board of directors effective as of February 21, 2024.
Common Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Common Stock, par value $0.01 per share
Trading Symbol FI
Security Exchange Name NYSE
Senior Notes Due 2027 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 1.125% Senior Notes due 2027
Trading Symbol FI27
Security Exchange Name NYSE
Senior Notes Due 2030 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 1.625% Senior Notes due 2030
Trading Symbol FI30
Security Exchange Name NYSE
Senior Notes Due 2025 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 2.250% Senior Notes due 2025
Trading Symbol FI25
Security Exchange Name NYSE
M 3.000 Senior Notes Due 20312 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 3.000% Senior Notes due 2031
Trading Symbol FI31
Security Exchange Name NYSE
M 4.500 Senior Notes Due 20311 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 4.500% Senior Notes due 2031
Trading Symbol FI31A
Security Exchange Name NYSE